External 2500mAh lithium-ion batterysTalk time: about 6 hoursStandby time: up to 72 hoursVideo play time: up to 2~3 hoursAudio playtime: about 7~8 hoursInternet use time: about 5~7 hours on 2.5G, 3~4 hours on Wi-FiCharging via USB to PC or power adapter